What it is
A potato defined by an archaic underground preservation method rather than a single cultivar, normally red-skinned and once also black.
Origin place card
Production/preservation is documented in Cusano Mutri, especially Calvaruso and Selvapiana, and other Matese mountain areas.
Verified history
The source describes the method as archaic, strongly consolidated over time and now nearly disappeared. Treat this as source-supported tradition/history from Regione Campania — Patata sotterrata di Calvaruso; the current evidence does not independently establish a founder, precise origin date, first attestation, or archival origin beyond that source framing.
Local hypothesis
This is one of Campania’s most cinematic pages: a pantry dug into the mountain floor.
Local legend / oral tradition
No legend documented; oral tradition should be gathered around pit locations, fern gathering and winter digging.
Ingredients
Potatoes chosen for consumption, free of rot and defects; female fern leaves and forest soil for pit lining/covering. Source-supported detail: Calvaruso e Selvapiana; altre aree montane del Matese (BN) Descrizione sintetica prodotto: La denominazione è riferibile a vari tipi di patata, di norma a buccia rossa, in passato anche nera, che veniva (ed in alcuni sporadici casi avviene tuttora) interrata
Method
Dig pits about two metres deep, line with female fern, fill with selected potatoes, cover with fern and forest soil, place in a drained position, then dig out in winter/spring as needed. Source-supported detail: Descrizione delle metodiche di lavorazione, condizionamento, stagionatura Le buche, di profondità di 2 mt circa, vengono foderate di foglie di felce femmina (Athyrium filix-femina) ampiamente diffusa nei boschi circostanti.
Ritual / calendar
La buca viene riempita con le patate scelte per il consumo, prive di marciumi e di difetti evidenti, e quindi coperta con un alto strato di felci, quindi con terreno di bosco sul quale veniva un tempo seminata la "Secena"
Why travel for it
A near-mythic preservation page: potatoes buried two metres deep in fern-lined forest pits, changed by months underground into sweet notes for gattò and crocché.
Recreate-it pathway
Recipe work should compare ordinary potato and sotterrata potato in gattò/crocché rather than invent quantities.
Editorial warning
Keep it as an archaic conservation method, not a separate botanical variety. Crosslink Matese and Monte San Giacomo storage pages.
Fieldwork questions
Are any pits still used? Can we film the burial/digging? Which families remember crocché from sotterrata potatoes?
Photo brief
Two-metre fern-lined pit, hands lifting potatoes from earth, gattò/crocché texture shot.